Paint and varnish remover.



T s ra'rss PATENT QFFIQE.

@OHN M. WILSON, 0F MONTCLAIR, NEW JERSEY, AND CHARLES N. FORREST, OF I BROOKLYN, NEW YORK, ASSIGNOR S, BY' MESNE ASSIGNMENTS, TO WILSON REMOVER COMPANY, OF NEWARK. NEW JERSEY, A CORPORATION OF NEW Patented Feb. 29, 19.16.

JERSEY.

PAINT AND VARNISH BEMOVER.

1.173.628 Specification of Letters Patent.

q a No Drawing. Application filed December 20, 1906. Serial No. 348,808.

.yet dissimilar waterproof cements and waterproofing compounds which are in'reality a species of varnish, it 1s essent al to produce an extremely slow-drying mixture,

capable of yielding asoft, wax-like film which has little or no allinity for the underlying surface, whereby its removal therefrom can be readily efi'ected.

Our invention'relates to improvements in that class of paint and varnish removers which contain wax-likeeompounds either in solution or in suspension'therein and has for its object the production of a mixture which evolves non-combustible vapors, which is'capable of producinga soft,:y'et

extremely tenacious ancl impervious film' upon the superficial evaporation, of the solvent thereof and which is stable and does not-deposit wax whenstored.

The paint and varnish removers heretofore produced which contain wax-like compounds therein, soondeteriorate, especially in the cold, oiving to the gradual deposition of the waxy particles at the bottom of the solution, with the result that the supernatant liquid is clear and practically free from wax. The finely precipitated wax of many mixturesnow in use, suspended therean, is alsoobjectionable owing to the fact that in practice it not onlysettles upon, and coats the surfaces to be treated, thustending= to p" exit the contact of the alcoholic solvent with the. varnished surface. but it settles in and clogs up the pores of the wood and the removal of the wax becomes dilticult as b A the remm'al ofthe original varnish without the agency of a paint and varnish remover,

Our experiments have led to the discow cries that if the relative quantities of the components of the mixture be suitably apportioned, a clear solution of alcohol, benzol (benzene) and wax can be obtained at temperatures varying between 20 to 32 0.; that the benzol and alcoholcan be ad 'vantageously replaced by turpentine and acetone or the alcohol alone may be substituted by acetone; that when acetone is sub stituted for; alcohol, the waxlin' its solid state can be added to a mixture of acetone and turpentine, or acetone and benzol, and

readily dissolved therein'by warming the 7 mixture, without necessitating the prior solution of the wax-in the benzol or turpentine alone; that a clear solution of "wax in carbon tetrachlorid, acetone and benzol, or wax in carbon tetrachlorid, acetone and turpentine can be obtained, whereas if alcohol be substituted for the acetone itwill not mixwith thew'ax dissolved in benzol and carbon tetrachlorid, but forms a distance layer above the same; lastly,:that various thickening agents when dissolved in a paintand varnish remover, prevent the crystallization and deposition of the wax art-normaltemperatures and thus permit the mixture when applied toact directly upon the varnish, in

lieu of indirectly, through an intermediate: layer of wax, above noted, since thewa-xdeposits as a film on the surface only of the liquid and occludes the remainder of the same.

In carrying out our invention we' prefer to proceed as follow/stone quart of acetone and three quarts of benzol (or a mixture of one quart of carbon-tetrachlorid and two' quarts of benzol inay be substituted fortlie benzol) are mixed together and to the mixture of acetone with the aforesaid com pounds, are. added two and-one-half ounces of solid paraflin wax and'then the mixture is heated by indirectsteam preferably to a I temperature below 75 C., until Solution 00- If desired.the benzol in'both of the mixtures mentioned can be replaced by an equivalent amount of turpentine substantially free from rosin.

When carbon-tctrach-lorid is utilized, which enables one to produce a remover that evolves non-combustible vapors, it is preferable to use at least 25% and lessthan 50% ofthe liquid mixture and similarly in order to produce an effective remover the acetone should vary between like limits.

In Or(le. to prevent the crystallization and separation of the wax in the above mixtures a collodion solution of a specific gravity preferably of .85 to .90 at normal temperatures is thoroughly stirredinto the same, the preferred proportions being similar to the: amount of wax, i. 0., a mixture of four galloss of liquids with two and one-half ounces of wax is treated with two and one-half ounces of collodion. The said collodion solution contains preferably 92.5% of solvent and 7.392. of residue. the solvent preferably comprising acetone and ethyl acetate. The admixture of the collodion solution can be readily accomplished at normal temperatures without resorting to heat.

Our invention also contemplates the formation of an alcoholic paint and varnish remover which does not deteriorate in storage and produces a soft, yet tenacious film upon the superficial evaporation of the solventthereof. In the preparation of such a mix ture we preferably proceed as follows; One quart of alcohol, desirably ethyl or methyl, is gradually added with stirring to a solution of two and one-half ounces of parafiin wax in three quarts of benzol (benzene). To the above mixture at a normal temperature is then added with constant stirring two and one-half ounces of the collodion solution similar to that above described.

The term collodion as herein used includes solutions of nitrated celluloses, pre fe bly gun-cotton in siiitable solvents such as acetone and organic esters, as ethyl acetate, or

alcohol and said esters.

Owing to the fact that a solution of paraffin wax in carbon-tetrachlorid is nonmiscible with either commercial methyl or ethyl alcohol, we do not desire toclaim the rendition oi'paint and varnish removers of such a nature, incapable of yielding combustible vapors diie to the use of sufiicient carbontetrachloiid to render the vapors evolved non-inflammable, but specifically limit the claims to mixtures containing a wax solvent other than carborr-tetrw chlorid, acetone or analogous compounds of the ketone not alcohol group, and sufiicient carbon-tetrachlorid to render both of said inflammable liquids non-inflammable.

In addition to the above advantages of our collodion-containing paint and varni'sh rem ers, the peculiar viscosity of the same is a property of no little importance, as its value for application to vertical or overhead surfaces is thereby greatly enhanced and not only is there an entire absence of dripping or any tendency to flow downwardly, but the dried film can be more expeditiously removed because of the fact that lar e shavings can be peeled off without the disintegration of the film intofine chips or powder.

The term wax as used in the specification and claims 1s generic and includes'various waxy bodies, when not otherwise specified, such as mineral vegetable and animal waxes capable of utilization in this art.

Having thus described our invention, we

claim:

1. A liquid paint and varnish remover, containing a solvent of wax, other than carbon-tetrachlorid, an actiw solvent of dried filmspf paint and varnish, a thickening agent comprising a compound of cellulose, wax, and sufficient carbon-tetrachlorid to render the vapors-evolved from the Sald mixture, non-combustible,'said mixture being capable of yielding a soft, yet tenacious,

impervious and substantially non-adhesive film, upon the superficial evaporation of the solvent therefrom, substantially as described.

9. A liquid paint and varnish remover,

containing turpentine, substantially free from rosin, acetone, wax, and sufiicient car bon-tetrachlorid to render the va ors evolved from said mixture, noncombustible,

substantially as described.

3. A liquid paint and varnish remover,

' half ounces of wax, two and one-half ounces of collodion solution,,.one quart of carbontetrachlorid, one quart of an active solvent of dried films of paint and varnish which is not a solvent of wax, and two quarts of a wax-solvent other than carbon-tetrachlorid, substantially as described.

Signed at Long Island City, in the county of Queens and State of New York, this 18th dayiof December, A. D. 1906.

JOHN M. WILSON. CHARLES N. FORREST.

' \Vitnesses: r 7

WM. L. "000, B. C. Vaxnsnwxrnn. 

